Just get a 5 gallon bucket, put a garbage bag in it, once it is full tie the bag and put it out with the rest of the garbage! Oh yeah I highly recommend covering it so if it rains the bucket doesn't fill up That is totally gross BTW! <GAG>
You could make your own waste disposal system out of a five-gallon bucket with a lid. Drill some holes in the top 1/4 of the bucket, dig a hole, larger and deeper than the bucket, place a layer of gravel in the bottom of the hole - enough so the top of the bucket is level with the ground. Fill the sides of the hole with gravel. Place the stools in the bottom of the bucket, add the digester that you can buy, add water and close. You add water every time you add stools, and theory is that the dissolved stools leave the bucket through the holes, and drain in to the rock. It will not work (digest ) when it is cold. Also the hole may fill up and not drain well, and then it is time to move the bucket - this is no different that commercially available systems, they want you to put gavel in the bottom of the hole too. In some ways it is easier to just put it in the trash.